Holes at the left side of the tray, with the top of the form at the rear of the printer

Use alternative letterhead mode

Use the Alternative Letterhead Mode feature to load letterhead or preprinted paper into the tray the same way for all jobs, whether printing to one side of the sheet of paper or to both sides. When using this mode, load paper as for automatic duplex printing.

To use the feature, enable it by using the printer control-panel menus.

Enable Alternative Letterhead Mode by using the printer control-panel menus

From the Home screen on the printer control panel, open the Settings menu.